Vibration device



FIG. 1 is a side view of a vibration device, showing my new design.

FIG. 2 is an inverted front view thereof.

FIG. 3 a rear view thereof.

FIG. 4 is a right perspective view, showing the back thereof; and,

FIG. 5 is a right perspective view, showing the front thereof.

Broken lines, if any, form no part of the claimed design. 

CLAIM The ornamental design for a vibration device, as shown and described. 